import { resolve } from 'path';
import { PrismaClient } from '@prisma/client';
import { normalizePemEnv } from '../../integrations/wechat/wechat-pay.util';
import { SYSTEM_CONFIG_KEY_SET } from './system-config.registry';

const PEM_ENV_KEYS = new Set(['WX_MCH_PRIVATE_KEY', 'WX_PLATFORM_CERT']);

function apiRoot() {
  return resolve(__dirname, '..', '..');
}

export function resolveEnvFilePath() {
  const isProduction = (process.env.NODE_ENV ?? 'development') === 'production';
  return resolve(apiRoot(), isProduction ? '.env.production' : '.env');
}

function normalizeConfigValue(key: string, value: string): string {
  if (PEM_ENV_KEYS.has(key)) return normalizePemEnv(value);
  return value;
}

/** 启动前从 DB 覆盖 process.env（在 Nest 创建前调用） */
export async function preloadSystemConfigEnv(): Promise<number> {
  const prisma = new PrismaClient();
  try {
    const rows = await prisma.systemConfig.findMany();
    for (const row of rows) {
      if (SYSTEM_CONFIG_KEY_SET.has(row.configKey)) {
        process.env[row.configKey] = normalizeConfigValue(row.configKey, row.value);
      }
    }
    return rows.length;
  } catch (error) {
    if (
      typeof error === 'object' &&
      error !== null &&
      'code' in error &&
      (error as { code?: string }).code === 'P2021'
    ) {
      console.warn('[config] system_config 表不存在，跳过 DB 预加载');
      return 0;
    }
    throw error;
  } finally {
    await prisma.$disconnect();
  }
}

export function applyEnvOverlay(values: Record<string, string>) {
  for (const [key, value] of Object.entries(values)) {
    if (SYSTEM_CONFIG_KEY_SET.has(key)) {
      process.env[key] = normalizeConfigValue(key, value);
    }
  }
}